Episode 3 - Loose Ends

Use the Historia Crux at the Southern end of Sunleth Waterscape to travel to the Coliseum. Head to the center of the arena and speak with the Arbiter of Time. The massive entity may seem frightening, but he won't cause you any harm just yet. In fact, he'll give you a Fragment just to have you go away and stop bothering him.

Fragment - White Hole Gem Speak with the Arbiter of Time in the Coliseum ??? AF.

Walk around in the Coliseum and look out of map. You can see treasure, just throw Mog and take it!

Now that you've solved the Paradox in The Archylte Steppe, you'll be able to deal with your previous Flan problem. Head to the central area of the Waterscape to confront a much smaller and newly weakened Flan creature.

The biggest danger in this fight is the blob's ability to Poison your entire party with ease. This can be easily remedied by keeping a Medic in the party who has already learned Esuna.

With that countered, Mutantomato doesn't present too much of a threat. His Stagger meter fills quite quickly, so use this to your advantage and unleash an all our assault with a three RAV party before switching over to Commandos to deliver the final blow.

With the beast defeated, Snow's work in this time is done. After he disappears, head to the Time Gate at the center of the map and proceed onwards to The Void Beyond.

Use your short stint here to approach the stairs. Toss Mog to either side of the throne to uncover a pair of treasure chests that are just out of reach. They contain the Prediction Gate Seal and the Calm Gate Seal.

With these in hand, your work in Episode 3 is done. Head on to Academia and Episode 4.